Some NetBSD are considering moving to Fossil. It's notable that Fossil's license is BSD while Git and Mercurial are GPLed. Some interesting pages pop up while search "NetBSD Fossil", like http://www.sonnenberger.org/ or interesting quote from Fossil's author in http://mail-index.netbsd.org/tech-repository/2010/01/18/msg0... :

"I suppose my biggest concern with Fossil and NetBSD is how Fossil might scale. We use Fossil on projects with a 1GB or larger check-out and with thousands and thousands of files. But I didn't really design fossil for truly huge projects."